Change menu_headings to accept color and attribute

Instead of just accepting an attribute, it's now possible to
use a color, or both color and attribute, for example:

OPTIONS=menu_headings:inverse
OPTIONS=menu_headings:red
OPTIONS=menu_headings:red&underline

Default is still just inverse.
This lets the player change the menu heading color without
needing to use menu colors for them.

Also makes it so the core uses NO_COLOR instead of 0, for all
the menu lines which don't have any prefedefined color.

Tested for tty, curses, x11, qt, and win32

doc/Guidebook.mn

@@ -4071,8 +4071,8 @@ Key to jump to the first page in a menu.
 Default \(oq\(ha\(cq.
 .lp menu_headings
 Controls how the headings in a menu are highlighted.
-Values are \(lqnone\(rq, \(lqbold\(rq, \(lqdim\(rq, \(lqitalic\(rq,
-\(lqunderline\(rq, \(lqblink\(rq, or \(lqinverse\(rq.
+Takes a text attribute, or text color and attribute separated by ampersand.
+For allowed attributes and colors, see \(lqConfiguring Menu Colors\(rq.
 Not all ports can actually display all types.
 .lp menu_invert_all
 Key to invert all items in a menu.

doc/Guidebook.tex

@@ -4449,9 +4449,8 @@ Implemented by the Amiga, Gem and tty ports.
 Default `\verb+^+'.
 \item[\ib{menu\verb+_+headings}]
 Controls how the headings in a menu are highlighted.
-Values are ``{\tt none}'', ``{\tt bold}'', ``{\tt dim}'',
-``{\tt italic}'', ``{\tt underline}'',``{\tt blink}'', or
-``{\tt inverse}''.
+Takes a text attribute, or text color and attribute separated by ampersand.
+For allowed attributes and colors, see ``{\it Configuring Menu Colors\/}``.
 Not all ports can actually display all types.
 \item[\ib{menu\verb+_+invert\verb+_+all}]
 Key to invert all items in a menu.

doc/fixes3-7-0.txt

@@ -1282,6 +1282,7 @@ docall naming of the monster that currently has the hero swallowed by
 	using their visible interior
 give missiles thrown or shot by monsters the same chance to get used up upon
 	hitting as when thrown or shot by the hero
+change menu_headings to also accept a color or color&attribute
 
 
 Fixes to 3.7.0-x General Problems Exposed Via git Repository

doc/window.txt

@@ -381,20 +381,7 @@ add_menu(windid window, glyphinfo, const anything identifier, char accelerator,
 		   If a window-port does not support all of these, it may map
 		   unsupported attributes to a supported one (e.g. map them
 		   all to ATR_INVERSE).
-                -- clr color will hold a color value including 24-bit
-                   true color values. To do that, and make it
-                   distinguishable on the windowport side of things, the
-                   windowport needs to treat it as follows:
-                      0      = not used, just ignore the clr value.
-                      1-16   = indicates a normal NetHack color value from
-                               0 - 15, so subtract 1 to get the NetHack
-                               color value.
-                      17...  = indicates a 24-bit RGB color value, so
-                               subtract 17 to get the actual 24-bit
-                               color value.
-                   When placing the values into this parameter, the core
-                   will add 1 to a NetHack color value, and add 17 to a
-                   24-bit RGB color value. 
+                -- clr is color and is one of the NetHack CLR_ defines.
                 -- str is a pointer to the menu item text.
 		-- itemflags on this item (such as MENU_ITEMFLAGS_SELECTED etc.).